74010366
Dec 13, 1989
Oct 15, 1991
DEVICES FOR DETECTING AND MONITORING INTERIOR ENVIRONMENTAL CONDITIONS; NAMELY, TEMPERATURE MONITORS, HUMIDITY MONITORS, WATER DETECTORS, RATE-OF-RISE AND LEVEL MONITORS, MOTION DETECTORS, SMOKE DETECTORS, FIRE DETECTORS, ENVIRONMENTAL EMERGENCY POWER-OFF SWITCHES, OPEN-AND-CLOSE AND DRY CONTACTS
Electrical and Scientific Apparatus